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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure evolution of directionally solidified DZ125 superalloy with melt superheating treatment
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Microstructure evolution of directionally solidified DZ125 superalloy with melt superheating treatment

机译：熔体过热处理定向凝固DZ125高温合金的组织演变。

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摘要

The melt superheating treatment is carried out for DZ125 superalloy during directional solidification.Under the same thermal gradient and solidification velocity, the microstructure evolution of directionally solidified DZ125 superalloy is systematically investigated by changing the melt superheating temperature. The results show that the dendrite is refined with the melt superheating temperature increasing from 1500 ℃ to 1650 ℃. However, it becomes coarse after the melt superheating treatment at 1750 ℃. The dendrite segregation first reduces with the increase of melt superheating temperature between 1500 ℃ and 1650 ℃, but becomes more severe when the superheating temperature is higher than 1650 ℃. The carbide morphology presents script-like when the melt superheating temperature is below 1600 ℃. Further increasing the melt superheating temperature, it is mainly blocky and nodular. Moreover, the reason of microstructure evolution with melt superheating treatment is discussed. The results are useful for promoting the development of high quality directionally solidified superalloy.
机译：在定向凝固过程中对DZ125高温合金进行了熔体过热处理。在相同的温度梯度和凝固速度下，通过改变熔体过热温度，系统地研究了定向凝固的DZ125高温合金的组织演变。结果表明，随着熔体过热温度从1500℃升高到1650℃，枝晶得到细化。但是，在1750℃进行熔融过热处理后，它变得粗糙。随着1500℃〜1650℃熔体过热温度的升高，枝晶偏析率先降低，但高于1650℃时枝晶偏析加剧。当熔体过热温度低于1600℃时，碳化物的形态呈脚本状。进一步提高熔体过热温度，主要是块状和球状的。此外，讨论了熔体过热处理引起的组织演变的原因。结果对于促进高质量定向凝固高温合金的发展是有用的。

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